MWD Tool Pressure Pulse Generator for Drilling Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current MWD tools are expensive, unreliable, and impractical for straight hole drilling operations due to their complexity and high maintenance requirements, limiting their accessibility to the majority of the drilling market.
Innovation Solution
A novel MWD tool system that includes a pressure pulse generator, sensor package, and controller integrated into a short section of drill pipe near the drilling bit, allowing for real-time data transmission of inclination, azimuth, and other parameters using pressure pulses, with a robust design to withstand harsh drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex MWD tools with wiring are used, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the wiring and complex electronic components from the MWD tool, eliminating them entirely. Instead, it uses the drilling fluid itself as the transmission medium for data, sending measurements from the bottom of the wellbore to the surface through pressure pulses in the mud stream, thus achieving measurement capability without complex wiring.
Solution Approach 2:
The patent employs hydraulic principles by using the drilling fluid (mud) as both the cooling/lubricating medium and the data transmission medium. Pressure pulses are generated in the fluid stream to encode measurement data, allowing information to be transmitted hydraulically without electrical wiring through the harsh downhole environment.
2Loss of time
If traditional MWD tools are used, then real-time measurement is achieved, but reliability decreases in harsh environments
Solution Approach 1:
The drilling fluid serves multiple functions simultaneously: it cools and lubricates the drill bit, transports cuttings to the surface, and transmits measurement data from the bottom of the wellbore. This self-service approach eliminates the need for separate transmission systems that would be vulnerable to failure in harsh environments.
Solution Approach 2:
The drilling fluid acts as an intermediary medium that carries both the mechanical function of bit cooling and the information function of data transmission. By using the existing fluid circulation system as the communication channel, the patent avoids introducing additional vulnerable components into the harsh downhole environment.
3Measurement precision
If MWD tools are used for straight hole drilling, then measurement capability is improved, but ease of operation decreases
Solution Approach 1:
The system is designed to be universal, working for both straight hole and directional drilling applications. The same simplified tool and fluid-based transmission system provides measurement capability across different drilling scenarios, eliminating the need for specialized complex tools for specific applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides affordable, reliable, and efficient real-time drilling feedback, reducing drilling time and costs, and is suitable for various well types, including straight holes, by eliminating the need for complex wiring and maintaining tool integrity in harsh environments.
Implementation Method 1
encoding information in pressure pulses in the drilling mud
Implementation Method 2
Drilling fluid, frequently referred to as 'mud', is pumped down the hollow center of the drill string
Implementation Method 3
This fluid circulation is used to transport the cuttings from the bottom of the bore hole to the surface
Implementation Method 4
exerts a hydrostatic pressure against the bore hole walls to help contain any entrapped gases
Data Source
AI summary
A method and apparatus used to transmit information to the surface from a subsurface location during the process of drilling a bore hole is described. A novel pressure pulse generator or “pulser” is coupled to a sensor package, a controller and a battery power source all of which reside inside a short section of drill pipe close to the bit at the bottom of the bore hole being drilled. The assembled apparatus or “MWD Tool” can be commanded from the surface to make a measurement of desired parameters and transmit this information to the surface by encoding data in pressure pulses generated by a pulser valve that includes a stator and a rotor which may be open and closed to create pressure pulses.